Warp stop mechanism for looms



' Sept. 2 1924.

C. D. BROWN WARP STOP MECHANISM FOR LOOMS 3 Sheath-Sheet 1 Filed Oct. 11 1923 Br mwP- ATTORNEY Sap? 2 1924. 1,507,132

C. D. BROWN WARP STOP MECHANI SM FOR LOOMS Filed Oct. 11, 1923 3 Sheets-Sheet 2 ATTORNEY Sept, ,2 1924.

C. D. BROWN WARP STOP MECHANISM FOR LOOMS Filed Oct. 11, 1923 5 Sheets-Sheet 5 TTORNE Patented Sept. 2, 1924.

UNITED STATES PATENT OFFICE.

CARL D. BROWN, 0]? HOPEDALE, MASSACHUSETTS, ASSIGNOR 'IO DRAPER CORIEOBA- 'IION, OF HO'LPEDALE, MASSACHUSETTS, A CORPORATION OF MAINE.

WARP STOP MECHANISM FOR LOOMS.

Application filed October 11, 1923.

To all whom it may concern:

Be it known that I, CARL D. BROWN, a citizen of the United States, and a resident of Hopedale, in the county of Worcester and State of Massachusetts, have invented an Improvement in Warp Stop Mechanisms for Looms, of which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts.

This invention relates to warp stop mechanisms for looms whereby on the occurrence of a fault in the warp the loom may be stopped.

lVarp stop mechanisms now ordinarily in practical use are located between the warp beam and harnesses, and in cases where the main portions of the warp stop mechanism are positioned below the plane of the warp threads it frequently becomes necessary to move the warp beam back out of interfering relation with the warp stop mechanism or limit the size of the mass of warp wound upon the warp beam,- and in such type of warp stop mechanism, an objectionable amount of lint is liable to accumulate on parts of the warp stop mechanism below the warp threads.

It frequently happens during weaving that as the warp threads pass from the warp beam frontwardly, a snarl may occur in the warp, or two adjacent warp threads may become stuck together by the sizing used in finishing the yarn, or in some cases one of the warp threads may contain an objectionable bunch or snarl in. its length, which if woven into the cloth would make a defect.

One of the objects of the present invention, therefore, is to provide a warp stop mechanism of such a character and construction that it will not necessitate that the warp beam be moved back, and at the same time permit the warp beam to be supplied with the normal or fullamount of warp. Another important feature of the invention consists in so called drop wires being constructed and arranged not only to effect loom stoppage should a warp thread break or become too slack for weaving purposes, but also in case a snarl occurs in a warp Serial No. 668,011.

thread or two of such warp threads be stuck together.

In accordancewith the present invention, the drop wires when supported in normal weaving condition by unbroken threads are below the feeler, and the feeler has a detecting movement above the drop wires.

The various features of the present in vention and new combination of parts will best be made clear from the following description and the accompanying drawings of one good practical form thereof, the true scope of the invention being definitely described by the claims.

In the drawings:

Fig. 1 is a sectional side elevation of a loom provided with the present invention;

Fig. 2 is a perspective view showing the main features of the invention on an en- {3 its operative position;

Fig. 3 is a sectional side elevation showing by full lines the relation of parts during normal weaving operation, and by dot ted lines one of the drop wires as having been moved into its operative position, with its end projecting upwardly into the path of feeler movement;

Fig. 4 is an enlarged perspective view showing more. particularly the drop wires and the various conditions that may occur in the warp threads during weaving.

The term drop wire is now usually em ployed for designating that part of the warp stop mechanism which is supported by the warp threads during weaving and is herein used in its broad sense to include any form of such drop wire that will function as hereinafter described.

The loom frame 1 may be of any usual construction and have associated therewith a stop mechanism. for effecting loom stoppage should a fault occur in the warp threads. As herein shown, the shipper 2 is pivotally mounted at 3 on a bracket 1} se cured to the loom frame and is connected with the train of stopping mechanism asusual, the construction being such that when the shipper isdetached from its holding lar ed scale and the feeler removed from warp I .a fixed part of the loom.

notch, as usual in loom constructions, the loom will be stopped.

Pivotally mounted on the loom frame at is an arm 6 the end 7 of which normally bears upon the shipper when the latter is in its holding. 1 otch and the loom is in running condition. ilonnected to the arm 6 is a rod 8 pivotally associated at 9 with an arm 10 which is itself pivotally supported at 11 on I Pivotally supported on the fulcrum 9 is a dog 12 adapted to be raised and lowered into and'from the path of a hunter 13 carried by the lay. In

the present instance thedog 12 is controlled in its movements from the warp stop mechan'i sinthroughla rod 14 connected at 15 to a dog controller 1 6, in a manner-substantially tlie sam'eas" that described in the patent to nit-ward s. stee est, No. 1,409,428, dated .14, 1 922, the constructionbeing such should the dog 12 remain in the path of the bunter 13 on the backward movement o1 the lay the shipper will be dislodged. from its? li lt ihs" m d. t be erre "At each side of tlie loom frame is a bracket or uppers 17, Fig. 2, to which is adjustably secured the frame l8'eiitending transversely of tlieloofnj. The frame 18 is shown as provided with side proj ectingdugs 19. having slots-20 through whiclrpass the adjusting and securing bolts. 21 so'that the frame 18 may be properly'secu'red in fplace and in the desired:adjustingposition.

Extending between the side members of the frame 18 are the warp rests or supports 22 and'intermediate the supports the drop drop wires are shown in the present instance,

but it will. be understood that the: invention n t esfr te' to th u ber o n of drop wires because any number of rows may eemp yedl .Thefdrop wires 25 are shown as of the plate forin' andeach is provided with openings 26 2?, one. at each side of the drop wire support 23 for engagement respectively with two adjacent warp threadsa, One "of the two adjacent warp threads passes through o'i e'n s 26 f t e; d op. Wire an h n overthe top of the drop wire 'support23, while thet olther' of the two adjacent warp threads igh the other opening 27 of the drop "the construction and arrangement be ch't s hen. t e Wars th d re in 'T- W 12s l tl ieii h f p W r 25 wfl l' be h'eld 'in an" inoperative position rel present instance the drop wires are oveisesojver the drop wire support 23 and.

ative to the feeler, to be described. Each of o the drop wires 25 is slightly over-balanced at one end, so that should both of the warp threads associated with the drop wire to maintain it in its inoperative position, become broken, and the drop wire thus befreed from warp thread control, the lighter end of the drop wire will beprojected upwardly into the path of feeler movement- In the weighted at that end containing the opening 27, which is the front end of the drop wires, and should both warp threads which contrib'ute'to thesu'p'port of the drop wire in its operative position, become broken or too ill slack, the rear end portion, that containing the opening 26, in the present instance, will be projected upwardly into the path of feeler movement and efilect loom stoppage, as

,will hereinafter more fully appear.

It happens at times that the adjacent vwarp threads may besnarled together, or a b u 'nch of lint may so joinjthe warp threads as to eyentuallycause breakage of one or both of themas the warp threads mjoveytowards the front of the loom during weaving operation. An important feature of the invention 'theretore consists in provlding each drop wire with a snarl detector which will detect the presence of a snarl inthe warp threads and on the occurrence thereof cause the drop wire to be moved into its operative pos tionto effect loom stoppage. The snarl preventerin the present instance is formed by therear edge portion of each drop wire Too whichis inclined with respect to the plane oi the warp threads, such that should a snarl occur it will engage the inclined rear edge of the drop wire, and as the warp threads move frontwardly during weaving, force the rear end of the drop wire upwardly into the path of 'fceler movement and efliect .9. 1 steriliseof eachdropwire has its rear portion 29. inclined upwardly such that should a snarl. asb, Fig. 4;, meet the upwardly inclined edge 29 of a drop wire as the warp threads move frontwardly, the snarl will cause the rear end. 28 of the drop wire engaged by it. to be projected upwardly into the path of the feeler.

As shown, the rear end 28 lower edge of the downturned portion 32 i being normally above 'the warp threads and above the'drop wires, but adapted to engage one or the other end of the drop wire should such end be projected or raised into the path of feeler movement. 1 I

The feeler is given its detecting movement through a train of mechanism which may be substantially the same as that shown and described in the Stimpson Patent, No. 1,409,428, March 14, 1922. As'shown, the side members 30 of the feeler have upwardly projecting arms 33through which extends the rod 34, the end projecting portions 35 of which are adapted to rest in the open sockets 36 of the arms 37 projecting upwardly from the feeler rock shaft 38 which may be conveniently supported in bearings formed in the side members of theframe 18.

Extending from the feeler rock shaft 38 is an arm 39 having an elongated socket 40, and extending upwardly through thearm 39 is an actuator 41 which extends downwardly and is pivotally connected at 42 to a cam follower 43 normally held in coopera tive relation with the cam 44 mounted on the shaft 45 at the lower end of the loom frame. A spring 46 serves to maintain the follower 43 normally in contact with the cam but permits it to yield. Between a collar 47 on the actuator 41 and the under surface of the arm 39 is interposed the spring 48, the construction being such that the feeler may be arrested in its feeling movement in either direction substantially as set forth in the Stimpson patent, hereinbefore referred to.

Secured to the feeler rock shaft 38 isthe arm 49 to which is connected the rod 14 hereinbefore described as associated with the dog 12 for moving it into and out of the path of the bunter 13.

The warp threads a are, as usual, wound upon the warp beam 50,- Fig. 1, and pass over the usual guide or roller 51 and thence frontward through the warp stop mechanism to the harnesses or shedding mechanism. As hereinbefore noted, two adjacent. warp threads are associated with each drop wire, one of the warp threads being passed through the opening 26 in the drop wire at one side of the drop wire support 23,j,then over said support towards the'front of the loom, and the other of the adjacent warp threads being passed over the support; 23 and through the opening 27 of the drop wire, the effect being that the two acent warp threads when in normal weaving condition, maintain the drop wiresin normal position, as indicated in Figs. 1 and 2, and wholly below the path of movement of the feeler. Should the warp thread which passes through the opening 26 of the drop wire break, the tension exertedby the other warp thread passing through thegopening 27 of the drop wire will cause the front end portion ofthe drop wire to be raised into the path of movement of the feeler and arrest the feeler in its detecting movement, and thus position the dog 12 for engagement by the bunter 13 on the lay, to effect loom stoppage, as hereinbefore described. This condition is shown by the position of the drop wireat A, Fig. 4.

Should, however, the warp thread which passes through the opening 27 of the drop wire, break or become too slack, the tension of the adjacent thread passing through the opening 26 of the drop wire will cause the rear end portion 28 ofthe drop wire to be raised into the path of movement of the feeler and effect loom stoppage. This condition is shown by the feeler at B, Fig. 4.

Should both of the two adjacent warp threads which normally maintain the drop wire in its inoperative position, become broken, as indicated at. C, Fig.4, the overweighted front end of the drop wire will cause the rear end 28 thereof to be projected upwardly into th path of feeler movement and effect loom stoppage.

Should a snarl, such as 7) occur in the warp threads, or such threads be stuck together as they move towards the front of the loom during weaving, the snarl or stuck together portions of the two threads will meet the inclined surface 29 of the drop wire, as indicated at D, Fig. 4, and raise the end 28 of the drop wire into the path of movement of the feeler and effect'loom stoppage. Thus the loom will be stopped shouldany one of the warp threads break, or should two adj a cent warp threads'break, or should a snarl occur in the warp threads as they move towards the front of the loom.

It may sometimes happen, owing to the number of warp threads in the loom, that one or more of the drop wires may be associated with a single warp thread. In this case, as indicated at E, Fig. 4, the single warp thread will, be passed through the rear-opening'26 of the drop wire, then over the top of the drop wire support 23, and then through the front opening 27 of the drop wire, and should this warp thread break, the overweightedfront end of the drop wire containing the opening 27 will cause the rear end 28 to be projected upwardly into the path of feeler movement and efiect loom stoppage.

Asshown in the present instance of the invention, the drop wire supports 23 are of circular form in cross-section, and each of the drop wires is provided with an opening through which the drop wire support may extend. To facilitate the application of the drop wires to the drop wire, support, each of the drop wires may be provided with a slot 52, Fig; 4, at E, of lessv dimension than the drop wire support 23, and the finger portions 53, constituting the side walls of h s t. r i e e; made a p n fingers which may be deflected laterally to a sufficient extent to permit the drop wire to be applied to the drop wire support in a direction transversely of the axis of the dropv wire support, so that when the drop wires:

30 of the feeler are preferably provided with guideways 54 into which may extend the flanges 55 projecting upwardly from the side members of the frame 18, as indicated inFig.2. I

From the construction described-it will be noted that the main portions of the warp stop mechanism maybe interposed between the warp beam andiharnesses without'necessitating any modification either in thesize of the warp beam or its economical position with respect to floor space, and that none of the parts of the main warp stop mechanism is located below the plane of the warp threads, the warp supports 22 themselves being susceptible of being formed shallow and of a construction which will not interfere with any of the p'arts' beneath; Any lint.

that may be formed during the passageof the warp threads during weaving will have free and unobstructed 'eXit without accumulation upon any parts of the warp stop mechanism.

While the train of mechanism for knockingoff the shipper is herein shown and described as of the same general'type as that inthe Stimpson patent, hereinbefore mentioned, and is effected by a bunter 13'asso;

. ciated' with the lay56, the present invention is more particularly directed to the'main parts ofthe warp stop mechanism, and any train of mechanism for effecting loom stop; page through the warp stop mechanism may be employ'e The warp supports 22 are arranged'with relation to the drop wires, so that'when a drop wire has one end projected upwardly,

the other, end may" come in contact with the adjacent warp support which will act as" a stop for determining the position of the raised'end of a drop wire, asindicated by dotted lineSQFig. 3, and full lines, 4

' What is claimed is:

' 1. In' awarp stop mechanism for, looms, e b na f a, d p 'wi e sil rqr e i d ng a ers y 9 th m; 'd qp Wire; p' v ae u upon he Slipper 'fq fi rocking movement' andadapted to e-niaintained in a normal. inoperative position by a warp. thread during weavingand to pivot upon the support and raise one or the other end of the drop wire into an operative position should the associated warp thread be broken or becometoo slack, a feeler having a detecting movement longitudinally of and above the plane of thewarp threads and drop wires, and adapted to engage the raisedend of a drop wire and be arrested thereby when the warp thread becomes broken or tooslack-,and; means Iiior stopping the loom when the feeler' is. arrested by the raised end otafdrop. wire. I

2. In a warp stop mechanism for looms,- thecom-bination of a drop wire support extendingv transversely. of the 100111, a series ofdropf wires pivotally hung upon the support for, making movement and each ad-apted to engage afwarp thread at one side of the support andanother warp thread at the opposite side ofsaid support during weaving that both ends of the drop wire may be held in inoperative position, "a feeler having a detecting movement longitudinal- 1y of 'and above the plane of the warp threads and drop wiresi andi adapted to be arrested by a drop wire when one end thereof is raisedv into the path of theifeeler by abnormal condition of one of the warp threads, and means for stopping the'loom when the feeler isarrested by the raised end of'one of the drop wires;

3. In a warpstop mech'anism for looms, the combinationof a series of drop wires each sustained in an inoperative position bythe joint action of two warp threads and having a snarl detecting portion by which a drop wire may be moved into its operative position by frontward movement of the intact warp threads in casev two warp 7 threads become snarled; or stuck together,

a feeler having adet'ecting movement, and Ine'ans'for stopping the loom should a drop wire assume its operative position due either to a snarl in the intact warp threads or by breakage or abnormal slackness in one of the warp threads. I In a'warp stop motion for looms, the combination of a feeler having a detecting movement above the plane of the warp threads, a series of drop wires mounted for rocking movementandeach sustained in its inoperative position by two adjacent warp threads, and each drop, wire having an inclined end portion facing towards the rear of th e loom andf'constitutinga snarl detector portion adapted to effect movement ofafdrop' wire about its fulcrum into operative position through engagement by a snarl inftwo adjacent warpthreads as they towardsi'the front' of the loom, and means for stopping. theloOm whe the fele -"is' r estd;'bra drqp re V *"5. "In arwaspstop mechanism 'for looms,

the combination of a series of drop wires loosely mounted for rockingv movement to permit either end to be raised into operative position and each sustained in its inoperative position by two adjacent warp threads, a feeler havinga detecting movement-longitudinally of and above the plane of the warp threads, and means for stopping the loom when the feeler is arrested in its detecting moven'le-nt by either raised end of a drop wire projecting into the path of the feeler.

6. In a warp stop mechanism for looms, the combination of a feeler having a. detecting movement longitudinally of and above the plane of the warp threads, a series of drop wires which are wholly be low the feeler when supported by normally conditioned warp threads during weaving and pivotally supported between their ends that one or the other end may be moved upwardly into the plane of movement of the feeler when a warp thread breaks or becomes too slack, and means for effecting loom stoppage when the feeler is arrested by a raised drop Wire.

7. In a warp stop mechanism for looms, the combination of a feeler having a detecting movement above the plane of the warp threads, a series of drop wires, each having a warp-snarl detecting portion, by which a drop wire may be moved into operative position by the intact warp threads as they move towards the front of the loom, and means for stopping the loom should either a snarl or breakage occur in the warp threads and a drop wire be raised into the path of movement of the feeler.

8. A drop wire for warp stop mechanisms for looms, comprising a plate having an opening between its ends for a drop wire support and a slot leading from the edge of the plate into the opening, and spring fingers for partially closing the slot but adapted to permit the drop wires to be placed upon the support transversely f its length.

9. A drop wire for loom warp stop mechanisms, comprising a plate having an opening for a drop wire support and a snarl detecting edge facing the rear of the loom when the drop wire is mounted upon the support and adapted to cause the drop wire to be moved about its support by a snarl in the unbroken or intact warp threads as they move towards the front of the loom.

10. In a warp stop mechanism for looms, the combination of a drop wire support extending transversely of the loom, a series of drop wires of plate form overweighted at one end and mounted for rocking move ment upon the support and each having an opening for the passage of a warp thread at each side of and below the support, and

threads break or become too slack, a feeler having a reciprocatory movement above the plane of the warp threads and adapted to be arrested by either end of a drop wire, and means for stopping the loom when the feeler is arrested.

12. In a warp stop mechanism for looms, the combination of a drop wire support, a series of drop wires pivotally mounted 011 said support and having a warp thread engaging eye at either side of said support by which the drop wires may be held in inoperative position by two warp threads passing over said support and each engaged with one of said eyes, a feeler having a detecting movement above the warp threads and adapted to be arrested when either end of a drop wire is raised, and means for stopping the loom when the feeler is arrested.

13. In a warp stop mechanism for looms, the combination of a feeler having a detecting movement, means for stopping the loom when the feeler movement is arrested, a series of'drop wires normally supported in an inoperative position during weaving, each constructed and arranged to be moved to operative position to arrest the feeler should one or both warp threads engaged thereby become broken or too slack and also to be moved into operative position by longitudinal movement of intact warp threads which are snarled or struck together.

14. In a warp stop mechanism for looms, the combination of a feeler having a detecting movement, means for stopping the loom when the feeler movement is arrested, a series of drop wires normally supported in an inoperative position by the warp threads during weaving, and having awarp snarl detecting portion by which a drop wire may be moved into operative position to arrest the feeler and eifect loom stoppage by longitudinal movement of the intact warp threads.

15. In a warp stop mechanism for looms, the combination of a drop wire support extending transversely of the loom, a series of drop wires mounted for rocking movement u on the support and each having a warp t read engaging portion at opposite sides of the'dropwiro supportyon end portion of a drop Wire being heayiei than the otherso that a drop Wire may be moved into operative position by rocking inoveinent upon its support due to the tension ofthe intact Warp thread when the coinpanion Warp thread breaks or becomes too slack and Will act by gravity to movie" to operative position upon its support when both Warp threads break, and a .feele having a detecting movement and adapted to be arrsted by an operativsly positioned In testimony hreof, I have signed my nam to this specification, I CARL D. BROWVN. 

